practice exam - CHEM 6B PRACTICE FINAL EXAM (Prof. Crowell)...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 6B Practice Final 1 A Prof. Crowell CHEM 6B PRACTICE FINAL EXAM (Prof. Crowell) May 28th, 2010 FILL IN YOUR STUDENT ID NUMBER , NAME , and TEST FORM = A 1. For the following four salts, determine whether water solutions of each salt would be acidic, basic, or neutral? The salts are: 1. KNO 2 , 2. NH 4 Cl , 3. CsI , 4. CH 3 COONa a) 1. acidic, 2. basic, 3. neutral, 4. acidic b) 1. acidic, 2. basic, 3. basic, 4. acidic c) 1. neutral, 2. acidic, 3. basic, 4. neutral d) 1. neutral, 2. acidic, 3. neutral, 4. basic e) 1. basic, 2. acidic, 3. neutral, 4. basic 2. Consider the titration of 100.0 mL of 0.500 M NH 3 (K b = 1.8 x 10 -5 ) with 0.500 M HCl. At the stoichiometric point of this titration, the [H + ] is: a) 1.0 x 10 -7 M b) 1.8 x 10 -5 M c) 1.2 x 10 -5 M d) 5.6 x 10 -10 M e) none of these. 3. For ammonia, NH 3 , K b is 1.8 x 10 - 5 . To make a buffered solution of pH = 10.0 at 298K, the ratio of NH 4 Cl to NH 3 must be: a) 1.8 : 1 b) 1 : 1.8 c) 0.18 : 1 d) 1 : 0.18 e) 1.8 x 10 5 : 1 4. 50.0 mL of 1.50 M NaOH solution is being titrated at 298K with a 2.00 M HCl solution. What will the pH be after the addition of 35.0 mL of HCl? a) 1.23 b) 11.70 c) 12.77 d) 2.30 e) 10.56 5. 180 mL of an unknown concentration of propionic acid, (CH 3 CH 2 COOH, K a = 1.35 x 10 - 5 M) is titrated with 1.5 M KOH at 298 K. The equivalence point is reached after the addition of 31.2 mL of KOH, resulting in a pH = 9.15. What is the initial concentration of propionic acid? a)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

practice exam - CHEM 6B PRACTICE FINAL EXAM (Prof. Crowell)...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online